BMW 11251261926 Mahle Piston

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Taken off the cylinder head and sump as described earlier in this article. Rotate the crankshaft clockwise with the aid of a spanner to the nut of the pulley such that the big-end of the piston or the connecting rod is at the lowermost level. Connecting rods and big-end caps are identified at points opposite to each other, and all series start at the front of the engine with no. 1. Remove Bieg-end nuts, rotate the cap and pull the piston /connecting rod assembly out from above the block. If there is a sever wear ridge at the top of the cylinder bore, it is advisable to scrape it away before pulling the piston, in order to prevent damaging the piston rings. Before final assembly, the bearing shells must be removed from the cap and rod; to help distinguish between them, use masking or have a spirit marker define on the rear of the bearing shells The essential differentiation is critical if reproducing the original shells. The gudgeon pin can be pulled out after take out the circlips and pushing the pin with fingers only but be careful with the position of the rod oil hole to the arrow on the piston crown for reconnection. Eliminate the first set of big-end bolts and nuts and acquire a new set of them. The piston rings are rather fragile, and open too wide during removal, they may break; previous to removing the rings place two or three old feeler blades or strips of tin behind each ring at proper intervals. Rotate the rings counter clockwise to remove them from the top of the piston so that the feeler blades stop a lower ring from falling lower as it is pulled out.

The gudgeon pin should fit snugly into the piston at room temperature.

The sequence numbers on the cap and rod should face to the right when viewed from the front of the engine.